As we age, we need to keep working at maintaining our strength and flexibility, and yes it gets harder the older we are. Also, for people who’ve sustained injuries, these areas can remain susceptible to further problems.
Let me recommend Brad Walker‘s book: “The anatomy of stretching” which can be purchased on Amazon for as little as £7-8 for a second hand copy or kindle version. It’s fantastically well set out with excellent diagrams. This is the place to start.
I also recommend finding a Yoga or Pilates class. There are classes going on everywhere for all ages and abilities. Sometimes it’s a matter of find a convenient class that suits you. If you’re pretty fit and want a challenge, let me recommend Faye Riches in Colchester.
You may like to check out The tree room (just up the road from me) in trinity street who have an extensive yoga timetable.