No offense, but ummm ... no. Take your cat to the vet.
If it's hyperthyroidism (and my parents' cat started yowling before she was diagnosed with it), your cat needs medical treatment: hyperthyroidism is treatable but will be fatal without medication. If it's deafness, you need to find this out to make some lifestyle changes to accommodate your cat's hearing loss. And if it's neither of these things, your cat could be yowling because he's in pain, and you need to find out why ASAP.
My parents' cat is 18 years old and still has regular vet visits. Yes, it's stressful for her, but her health is important to my parents and the only way to know for sure what's going on with her is to ensure the vet sees her. Some vets are willing to make house calls for cats with delicate health issues; if that's the case for you, you can always ask your vet if s/he does house calls, or if s/he can recommend another vet who does.
Advanced age is not an excuse to stop taking your cat to the vet, especially when it's obvious your cat is in some kind of distress.