t'aint,
I'm about to do a helicopter instructors course in a month or two at a similar age, so I'll let you know if I agree. However, a couple of weeks ago I was discussing the course with three YOUNG instructors, who were all saying it was the hardest thing they'd ever done. But, you see, they didn't blame that on their age.
This whole issue reminds me of something I once read with respect to memory and age. The writer said that older people blame forgetting things on getting older. Yet six year olds come home from school, and say: "Sorry, I forgot to give my note to the teacher, I left my homework at school, and I can't remember where I left my gym bag". But they don't say they have a bad memory because of AGE - they save that for 40 years later!