呆(ぼ)けるto grow senile, to be childish with age, to be mentally slow, to be befuddled, to play stupid, to say something stupid (oft. on purpose; esp. as part of a comedic routine), to become engrossed (in something)

ボケてきたが、認知(にんち)症(しょう)だろうか…。

I've started to grow senile; could it be dementia?

ピントがボケた写真(しゃしん)なんかいりません。

I don't need a photo that's out of focus.

まだ５０歳(さい)…ボケるには早(はや)すぎると思(おも)います。

I'm only 50... I think it's too early to grow senile.

論点(ろんてん)がボケているから、もう一度(いちど)論点(ろんてん)に返(かえ)った方(ほう)が良(よ)さそうだ。

The point is blurred, so it seems better to return to the main topic once again.

歳(さい)をとるとともにボケてきた気(き)がして、心配(しんぱい)でしょうがないです。

I feel like I'm growing senile as I age, and I can't help but worry.