The purified Shari`ah (Islamic Law) recommends Muslims to sponsor orphans and promise them with a great reward for this. If the reality is as you have mentioned, (Part No. 14; Page No. 244) that you have been sponsoring this fifty-year-old man and you want him to leave the house but he refuses, then keeping him with you is considered
Ihsan (perfection of faith) as long as there is no Khulwah (being alone with a member of the opposite sex) between him and non-Mahram (spouse or permanently unmarriageable relative) women. If you insist that he should leave your house, you are not to be blamed for this. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.