Sayyiduna Fadl bin Abbas (may Allah be pleased with him) says: A woman came to the Messenger of Allah (peace and blessings be upon him) and said: Hajj has become obligatory upon my respected father while he has grown old and cannot ride a camel; shall I perform Hajj on his behalf? He (peace and blessings be upon him) said: "Perform Hajj on his behalf."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8628