How old is my cat?

A month ago I adopted a cat (I've named Mycroft) from a shelter. He is my first cat, so I don't have a lot of experience identifying the age of a cat by its appearance.

I was told by the shelter that the cat was given to them by his only owner, he had been an indoor cat his whole life, and that he was to years old (birthdate April 1, 2014).

Today I got him his first hair cut, and the groomer commented on how loose his skin is. I had originally noticed that his belly sagged a little, but when I research this online I found that this was normal. He has long hair normally, but now that it is cut his sagging skin is very apparent, and it isn't localized to his stomach. The groomer told me this is indicative of an older cat.

I should clarify that I love my cat, he's a wonderful friend and it doesn't really matter to me if he is older than what I thought. I would like to get an estimate on his age however, so that I'll have an idea if I should look out for issues relating to older cats (ie. switching to senior cat food and the like).

sorry, I mean TWO years old...

...and the birthday should read April 1, 2012 ---I need to start proof reading.

Most vets go by the teeth -- colouring, condition, tarter. They also look for cloudiness in the eyes which comes with age. With one cat that I didn't know the age of, the vet gave me a different estimate every time the cat was examined.

If he's an owner surrender then it is likely he is in fact, 2 years old. I've never heard someone say loose skin indicates an older cat. Cats in general have loose skin.

As someone else said, teeth are the typical indication of age though that is no guarantee depending on genetics and previous dental care. Though for "unknown" backgrounds, it helps guess. But since this cat seems to have a background and known birth date, that's what I'd go by.

Groomers are groomers, not pet experts. I've worked with plenty who were ignorant about care, nutrition, health and even breeds. I wouldn't put much worry over what she says.

Awesome, thanks so much for your responses!

His eyes seem bright, and he has all of his teeth, so I think you are right in saying I shouldn't worry too much about the skin. I have read elsewhere that it is normal for cats to have loose skin because it helps them move faster. Perhaps the groomer was confused because loose skin tends to be an indicator of age on dogs, which she primarily grooms.

Thanks for your incite!