2 sentences

1. 我只比你小三岁。

   wǒ zhǐ bǐ nǐ xiǎo sān suì.

   I'm just three years younger than you.

   Source: OpenSubtitles

2. 她比他小三岁。

   tā bǐ tā xiǎo sān suì.

   She is three years younger than him.

   Source: AI Challenger 2017