This statement has a special resonance for me. My Dad passed away last week, he was 86. Never got certified, but tried it twice, while on holidays, both times with me. I was sooo happy. Last time was around 20 years ago, in Crete.
It was around Easter, always a complicated time to dive the Med : high wind, cold water, and a shy sun. He wouldn't hear of diving with me, his answer was something like : I'm too old for this sh.. Until, I told him : I'm diving from a place called Mononaftis, there's an old minoan jetty underwater, and broken antique pottery everywhere. As a retired teacher who taught some Latin for years and was deeply interested in Latin and Greek history, he changed his mind quickly. We had excellent condition and hugely enjoyed the dive, more than 40 minutes underwater. A very dear memory to me.
Here's a picture, my Dad's on the right.