Sayyidah Aishah (may Allah be pleased with her) said that the Prophet (peace and blessings be upon him) permitted the old man to kiss while fasting and forbade the young man from it, and he said: "The old man can keep control of his urge, and the young man spoils his fast."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8084