The effort levels are based upon your personalised power profile, which is age-independent, so regardless of your age, so long as your 4DP is fairly current then you’ll be in the ballpark.
With things like the “All-purpose road” plan, the workload to rest balance adjusts depending on whether you choose Novice, Intermediate or Advanced.
It would be hard for them to adjust for age because a 50-year-old who has really taken care of themselves may still work and recover better than a 30-year-old who has done nothing but live in Couchlandria since their teens.
While there may be some latitude for adjusting relative to age, it would be difficult to get right without potentially disadvantaging some of your highest performing older customers.
I would suggest ensuring your 4DP is current and then picking Novice, Intermediate or Advanced based upon how much recovery you feel you need is the way forwards.