If a man converts to Islam and is quite mature in age – i.e., over forty – it is very difficult for him to be circumcised. Is it OK if he does not follow this particular practice?
Praise be to Allaah.
If circumcision after converting is too difficult, because of his age, then it is OK if he does not get circumcised. Circumcision should not be insisted on, lest it turns him away from Islam.
(Fataawa al-Lajnah al-Daa’imah, 5/115)