Hello,
I'm a low baritone with no genetic musical ability. I've been teaching myself to sing for two years, and although my pitching is quite good, I cannot sing above E in chest voice. I do not have a head voice or falsetto so I make a strangled squeak and try to develop it. I have a band because I can write songs easily, and need to sing like a tenor to bring out the best in these songs.

I can start a sort of combined note up to the G, and although it's odd, I can express the passion I feel. If I could scale up to G I'd be so happy.

I'm 71.

Hello, I' m baritone too. I have improved my range by a book and exercises of a vocal coach. We could talk about it more in private if you don' t mind.

My advice is to get a vocal warmup / exercise CD and practice daily if you can. Just be careful and don't strain your voice. Over time you will see your range / stamina improve.
Good Luck!