40 yr old boyfriend cant keep up with 21 gf wanting all the time?

my boyfriend is 40 and i am 21 we have 2 or 3 times a week i would love once a day atleast lol he works all day hard in the sun and most work days i dont get it. i hate that! but he is just to tired i tell him "waaa his 21 yr old girlfriend wants to much tell anyone that theyll laugh at you" but he is a kick *** guy. i love him but this drives me crazy he says if we had one kick *** session a MONTH he would be good to go is that normal!! how often are 40 yr old men having ? or wanting to depending on willing woman. im starting to think i want it to much. i want it all the time. should i just take a chill pill??