生产生活方式，养儿防老的观念，遵循先民习俗是幼子继承制长期存在的原因。

It exists so long simply because of their production and life-style, the concept of supporting the elderly and following the customs of their ancestors.

此外，日本完善的社会保障体系，使得人们不必要“养儿防老”，这也是加入“丁克”家庭行列的日本年轻夫妇数量增多的重要原因。

Moreover, Japan's perfect social security system, make people unnecessary "and", this also is to join the ranks of the "dink" family increasing number of Japanese young couple important reasons.

不仅仅是事业，生活也是如此，生孩子干吗用的，相信不只是传统观念里的传宗接代和养儿防老，现在的孩子能不啃老已经是不易，为的是满足心理的需要-我需要孩子。

Not only bussiness but also life is the same. Why most people have baby ?Only live and raising children for old time ?It is not easy to live by parents.