You asked about increasing metabloism. 1 thing has been found to be the most effective in increasing calories burned ....... EVEN while sleeping. MORE MUSCLE.
Yes, muscle takes more calories to be maintained , thus the more muscle the more calories your body requires & burns. This is scietifically measured. Yes , your calory rate of burn can be measured & your b.m.i.= body mass index. As we get in our 60's our body naturally starts to loose muscle thus it is more important to be active & do weights to keep toned & maintain muscle tone. Cheers. 1 other thing, is the studies find our body also burns more calories if well hydrated. Thus keep hydrated but that does not mean drink too much water.