Can I make an older feral cat a house cat in a different city?

I lived in a house for 3 years up in the hills and met an adult feral male cat, named TAZ, I neutered him.  I took in a sick stray 7 month old, named Tanji.  They both got to know each other because I would leave a window open for the older feral, Taz and Tanji was only a kitten at the time.  The loved each other and played great with each other.  Our yard was huge and fenced, a place he lived and play safe.  He would never be a full time house cat as he chose to live both in and out.  Well we had to move but the owner of the house said he will take care of Taz as I could not take him with me with the possibility of him getting out and getting hit by a car.  5 years later now, Taz is still coming around my old rental and the owner still feeds him.  He must be at least 10+ years old since the place that neutered him said he was around 5 years old.

Now I am in a place that can take Taz in.  A safer neighborhood even though very far from where he is currently.  I am back in a house but this might be temporary as we may move again.

Would it be a good idea to bring Taz here with me now that I am in a house to keep him full times in doors now that he is much much older?  Will he, Taz remember Tanji (both males) and get a long (of course with the proper separation and quarantine process)?  Or should I just keep him where he is at?  He rarely goes indoors because the owner has one of his off springs that is a bully and chases Taz which Taz does not enjoy.

What do you all advise me to do?  I just want the best for him.  And yes I keep in touch with the owner of the house after all these years and have visited him couple of times and he remembers me.

Thanks

Given his age, I would be inclined to take him to your new home.  You'll need to keep in indoors for at least two to three weeks or he will try to return to his home.  Be prepared for yowling but be patient.  I don't know if the two cats would recognize one another.

I brought in a feral male cat indoors after years being outdoors. He was getting older and I noticed more banged up from being in fights. It took several month but he became more and more used to being indoors. After 2 years he is now only an indoor cat. He will let me pet him but I can't pick him up even after 4 years, so he is not even neutered. I think you will probably have an easier time of trying to keep yours indoors. If you give them a good view and plenty if food they'll stay for you.

Thank you do much for your devotion to this kitty!  You will have to confine him somewhere for a few weeks or else he will try to get back to his own territory (your old house).  Just to be on the safe side, I would re-introduce the cats like they were complete strangers.  If they remember one another, that process will go more smoothly but if they don't, it will help get them used to one another.

Thank you for all the advice.  I can't risk him (adult feral) getting out of our current home and trying to get to his long time home in the coyote filled hills of Los Angeles that is 18-20 miles away in a car.  For sure he would die especially at his age.  I guess he is safe and happy where he is since he has been in that area all his life and the owner of the other house still takes care/feed him.  I think if I lived in the area I would for sure take the change because he can still get home.  Thanks again

Then I think you've made the right decision.  It would be different if he didn't have someone to care for him but he sounds safe and happy.  Again, thank you so much for your devotion to him!

I realize it must have been a very hard decision to make.  Your love and devotion for this cat can be felt.  You know right now that he is safe and well cared for.  You can still pop into to see him when you are in the area and maybe bring him something special such as some really yummy food. 

It was hard to leave and I cried to leave him behind but at the time I knew the owner was moving back in and willing to care for him.  I think he knew too as he wouldn't come to me and stayed in the tree.  I have visited him throughout the years bringing my camera and a can of cat food.  He has always remembered me.  Here is a photo the new caretaker sent me in the past on summer.  I am due to see him this month.  Will let you know how it goes and thanks for letting me know it's okay to let him be.  This house has a fully fence yard with 1/4 acre and knows how to get up on the house so he knows how to be safe.

Thank you for making feel this is the best thing for him then then satisfying my guilt.  

He looks like the happiest cat on earth!  Thanks for sharing that picture!