so ladies Please Answer me and get back to me .. so me and my Fiance have been ttc for 14 months now. well now hes telling me he was something wrong in his "Testrone" and i looked it up

so my Fiance is telling me hes sad because he has "low testrone" is what i looked up to see what he was talking about . well it says men up to there 50's get that for issues and im not sure if thats right My Fiance is 20 Years old . and honestly i feel like hes lying he told me He went to the hospital and got "checked" but i dont believe thats true . he does want a baby (obviously we have been trying for 14 months) and i guess he just wants to give up . but i dont understand why make this up unless it is the truth and guys can have low testrone at any age . my fiance does smoke (ciggaretts) and i told him Not to because we are ttc and i know there bad for you . well i want to know if this is true and can any of you ladies tell me what should i think ?