mudsticks
Obviously an Aubergine
I am 56 and buff. It's down to a lifetime of sport..................but that sport has dwindled now to just cycling. Enter middle age and if you don't use resistance weights then your body is going to go downhill and you are not going to look good (physically), no matter how much cycling you do. It's alright saying you don't need it at 45, or you've always been fit, or you've always done a manual job........past 50, get on the weights.
So, I have "off" times when I just can't be bothered but generally I respond quickly once back in the swing.
As I get older I find it takes longer to recover after a weekly 'total fitness' session I take part in - exercises with light weights. It doesn't seem to get any easier and muscles ache for longer. I'm the oldest there by decades and it's hard work. However I'm encouraged by knowing that I'm still fitter than most of my contemporaries who don't cycle or take much exercise.
Yes you do need to do some kind of strength or impact exercise - in addition to the aerobics of cycling - to maintain bone density - and avoid osteoporosis - at any age - but particularly in middle age onwards - a combination of types of activity is best - it doesn't have to be 'weights' in the conventional sense though - even reasonably energetic gardening or housework can give you a good workout.
And dancing - as someone mentioned above can be fun too.
The trick is not to stop altogether - even if you get ill or injured - pick yourself up afterwards and keep doing what you can.