I can't eat as much meat now that I'm getting older because of the fat on the meat.
ーI can't eat as much meat now that I'm getting older because of the fat on the meat.
「歳とともに肉があまり食べられなくなってきた。肉の脂のせいだ」
can't eat as much ... now で「もう…があまり食べられない」
to get older で「歳をとる・歳を重ねる」
ーWhen I was young I could eat lots of meat, but not anymore.
「若い頃は肉をたくさん食べられたが、もう（たくさん）食べられない」
not anymore で「もう〜でない」
ご参考まで！
カナダ 
