The near-universal access to smartphones, starting at ever younger ages,is transforming modern society in ways that can have negative effects on physical and mental health, neurological development and personal relationships,not to mention safety on our roads and sidewalks.

解析：

1.   生词及短语：

Smartphone n.智能手机  near-universal adj.几乎普遍的

Have（get）access to 接近.......，靠近...........

At younger age在年轻时代   sidewalks n.人行道

Have negative effects on sth 某事有不利影响

Physical health 生理健康   mental health 心理健康

Neurological 神经学的      personal relationships个人关系

Not to mention 更不要提，更别说

2.      句子结构：

3.   参考译文:

现在，几乎人人都能接触智能手机了，并且呈现出年轻的态势。这改变了当代社会，对身体健康和心理健康、神经发育和个人关系都产生了消极影响，更何况道路安全。

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