Oh for goodness sake, I was well past 30 before people stopped saying I was too young to be given any real responsibility.
Anybody under 45 now is unlikely to retire below 70 anyhow - don't get caught up in the cobblers cult of youth that pervades the world these days. Sooner or later we'll have a series of "Dobby the over-50 vampire slayer" and it'll all settle down again to a realisation that if you can get the medical, do the job, and have at-least 10 years before mandatory retirement, and you're fine.
G