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I play 5s too, do my weights, squash, Bikram yoga and a bit of social walking (to get my step count up) and at 50 I have too many aches and pains.
I take BCAAs before weights and squash - they seem to help but there could be a placebo affect too.
I am pretty active on my days off and am almost always aching - but, in a good way.
I have noticed that old injuries are starting to impact on my body - mainly one knee (rugby injury from school) and my lower back (motorbike accident in my 20s). I also have shoulder pain which affects my OHP and bench - this causes the most annoyance.
I think you just have to get on with it and suffer a little EXCEPT when you actually get an injury when lifting - at that point STOP. Stop your workout and do not do anything until the injury recovers. Age affects recovery after injury and a small muscle pull can turn into a tear and then you are losing weeks of training. If you are younger, the loss of time is minimal.Time for weights ....
State of me trying to get out of bed at age 37, the day after playing 5s.