First Congrats on being consistent with your routine!
As a CPT, INHC Health Coach, experience as OTA and mom of four age 54;
I can not say enough the importance of strength training as we get older.
Yoga is so helpful for mobility and flexibility and strength. However, as we age we lose our muscle mass and weight lifting helps maintain and builds our muscle. Seeing a certified personal trainer or therapist is recommended to assess your functional alignment and your areas of strengths and weaknesses that may be contributing to your overall health.
Be kind to your self and rest/recover when your body is telling you too. @brendalamparyk