I have to agree with Duke. I'm not sure that age really matters that much. The one I received from a 57-year-old was easily the worst. That said the blowjob and sex with a 62 year old was amazing. The first I received when I was 13 from a 16 year old sticks with me probably because it was my first. The most memorable is the 25 year old I was seeing. Not sure what it was about her but thirty years later I still get hard when I think of her.
Enthusiasm is the key element to providing a great blowjob. Whether young or older, male or female, if he sees and feels your enthusiastic mouth working his cock and balls his experience is going to be a very enjoyable one. If you enjoy giving blowjobs and do so with great enthusiasm, he is most likely going to compliment you for doing such a great job afterwards.
I will say it again, it’s not always about age I have had my mind blown (and another part of my body!) by a young woman who to this day is still THE best, and a 40’something who wasn’t as good but I think she is one top amazing cocksucker.
Blowjobs are one thing where age hasn't mattered a bit in my experience, comes down to the effort she is putting in and the ones that are doing it cause it gets them off are the best