According to the question,
Sashi is 2 yearr elder than Sunita
Sashi > Sunita
Sunita is 3 yearr elder than Bindu
Sunita > Bindu
Shekhar is 1 year elder than Bindu
Shekhar > Bindu
After arranging the Data
∴ Sashi > Sunita > Shekhar > Bindu
So, youngest person in the group is Bindu.