JasoninHalifax wrote:
I disagree about swimming being too hard. It's like triathlon, or running, only as hard as you make it.
It's more about facilities, culture, a disconnect between outsiders perspectives of the nature of the sport and the actual nature of the sport, typically less flexibility in training, and people are initially intimidated by the prospect of swimming that far in practice.
i.e. people perceive swimming to be far harder than it is.
In terms of "hard" to sustain at age, biking is the easiest to match your youth, second is swimming, last of course is running...all for obvious reason.
To kind of answer your question, you are too old and you're not too old. The reality is that you MUST be too old because if you were not, guys your age would still be winning the olympic games and THEY ARE NOT.
At a personal level you can beat your youthful times by more optimized training, science, better technique and rest, but this might be because you never optimized your times at youth....in drive by brag territory, I ran my half marathon personal best at age 44. It was 1:21.09. BUT I actually posted my fastest half marathon time in the opening half of a marathon when I ran 1:19 which I did at age 25. That was 5 weeks after my first IM so I was barely recovered....I relatively blew up and ran the second half in 1:31....but if I actually raced some half marathons at 25, I have no doubt, I could have done a 1:15ish range based on my 10K times in the same period. So yes, I set a PB at age 44, but its cause I never really tried to properly race a half marathon when I was young and running fast.
I think to set some swim PB's for races in the 5 minute range or less at age you have to get in the weight room and do a lot of hard sets. You have a lifetime of volume and technique, but a 1-4 min race has a massive anaerboic component that you lose with age. Endurance you will lose less. Love her or hate her, look at the variety of training Dara Torres was doing to go to the Olympics in the 50 free at 40. She was competing at a world level, but even for what you want to do, you have to work the anaerobic system because that is what you lose and in the range of duration for your events, this is what will help you or hurt you.