Just joined the club, 63 years old, started SCUBA diving when I was 16 when I joined the British Royal Navy. In 1968, aged 20 I became an RN Clearance Diver and in 1974 a Commercial Diver working the offshore oil fields worldwide. I stopped Commercial Diving in 1987, aged 40, but still SCUBA. My partner, Meryl, also dives as a PADI Open Water Diver and my daughter, now aged 11, did her PADI Bubble Maker Course when she was 8 and this year made PADI junior Open Water Diver.
As to an age limit for diving - there is none all you need to enjoy diving is a full tank of air and the love of going under water.
I am still working in the Offshore Diving Industry as a Dive Lead for ExxonMobil, once the diving scene is in your blood you will be hooked. We plan our holidays around diving and water sports, we are also luckily enough to own a 2 bed roomed apartment in Sahl Hasheesh, Red Sea, Egypt - you know that place where sharks eat people..!! Only kidding, but a great place to dive or learn to dive.
Anyway, enough about me - keep sucking and blowing..!!