If i strained/sprained my achilles tendons 10 years ago and they still get achey sometimes, is there anything i can do about that? cause for concern?

Yes: Have you consulted your provider. You could have developed arthritc changes and sometimes you could have developed calcium deposits or they have not healed well. Please consult your provider.

Eccentric strength: You likely have some degeneration of your Achilles which led to the "sprain" in the first place and now causes achy pain. Your sports med provider can prescribe a series of specific eccentric resistance exercises that have been shown in many studies to be the best non-surgical treatment for Achilles tendinopathy. You are at slight higher risk for a complete tear, but i wouldn't be too concerned.

The concern is: We prefer yo not to have achy anything. Physical therapy is something i would recommend to try and strengthen your achilles tendons. I would also look at biomechanical issues related to you such as flatfeet, or an equinus deformity. (this is when range of motion at the ankle is lessened.) a podiatrist would be able to help you with that and also give you the referral to the therapist.