9.2 nmol at 51 years old. What are my options?

I'm 51/male and I live in the UK. I recently had a serum testosterone test as part of my annual check up and it's 9.2 nmol/L (Reference is 6.7 to 25.7 nmol/L)

Isn't this considered low? My GP said they don't do anything unless it's below the threshold.