I am absolutely sure that it is possible to progress after the age of 40. To do this, it is necessary to understand the amount of time it takes to restore each muscle group. Basically, of course, it concerns the tendons. To do this, you need a plan with load re-optimization. In addition to heavy training, there should be light and medium in severity.
It is also necessary to ensure that the body is in good functional condition. Endurance is something that an age athlete cannot do without.
Good sleep, control of blood biochemistry, control of blood pressure and the work of internal organs are important.