There are a number of ways to measure frailty. This particular scale from the Canadian Study on Health & Aging is very useful, especially as it gives clear, easily recognised markers.
If you have noticed changes in your activity levels, it may be worth considering what can be done to help you remain as capable as possible.
*IADLs (see category 5) are Instrumental activities of daily living. These are activities which allow an individual to live independently such as, housekeeping and cleaning, preparing meals, managing money, managing medication etc
If you are reading this and you are in category 1-3, the general advice is to maintain or increase your activity in order to be as strong and capable as possible. We would always recommend consulting your medical practitioner first. Overly stressing the body and increasing your exercise regime too quickly may be detrimental.