It's seems like your egoistic short-term-minded happiness plan,not for them. Because at that less energetic age,older parents seek long term peaceful things which you will personally know. For every parent,it's like financial and social stability(Respect,Good will,Admiration,Pride) of their child which would give them ultimate happiness and you ensure them that you are on this track. And emotionally,your very presence before thier eyes will bring joy n happiness