Number of meat?
It doesn't matter much how much russia does have. If count out females, kids, pensioners, disabled, alcoholics and drug addicts etc....not so lucrative scene...
Pensioners might in some cases be valuable, for example to repair technique etc, why not, especially if it is USSR era stuff..if they are not too ill, might repair faster than youngsters.... ofc if they does have experience. While to dig trenches with shovels they aren't usable.
In some cases with excavator they might be pretty capable...
Russia is hiring foreigners...a lot of foreigners.... while ofc as usually are crying that ukr does have mercenaries. Russia uses a lot of mercenaries hired from former USSR countries and also is hiring immigrants already located in russia cos other reasons.
They are hiring also ppl from africa and asia...