Age comes for us all, and losses in strength, power and co-ordination can have a big impact on our quality of life in later years.

Yet the slow march towards immobility doesn’t have to be inevitable. Engaging in physical activity isn’t just a way to pass the time, it can also counteract declining heart health and the gradual decrease in muscle mass (sarcopenia) and bone strength (osteoporosis) that can stop us in our tracks as we start to get on a bit.

But what does it mean to be “fit” for your age? This is a blueprint for what your body should be able to achieve in your thirties, forties, fifties, sixties and seventies.

Measurements of strength vary according to your training history, but even