David Bentley responds to an article on reaching peak fitness through the decades. Plus letters from Shirley Foster, Laurence Kaye, Janet Vaux and Huw AdamsHannah Coates’ article (From strength training in your 20s to yoga in your 80s: how to reach peak fitness at any age, 31 May) covered ages up to 80, as did another similar article earlier in the week (28 May). What about those over 90 like myself, 94, still active on the rowing machine (11 minutes 16 seconds for 2,000 metres)? In the same week, there was also an article describing a very fit 105-year-old. Our county, Surrey, is home to Britain’s oldest person at 115. Don’t forget the over-90s in your articles on fitness.David BentleyEnglefield Green, Surrey• I and my 80-plus-year-old friends fell about (voluntarily) laughing when we read that we can consider ourselves “in good form” if we can walk unaided for 10 minutes. Since many of us regularly hike, garden, swim, cycle and play tennis, we clearly need to examine much more closely the fitness standards for our age group. Or maybe we should just retire to our Bath chairs?Shirley FosterSheffield