How to set start and end date in js calendar?

Question

React

you need to get the start and end date for the allowed date range. Input field (react)

<Datepicker 
onChange => {this.handleChange}
value = {this.state.value}
restr = {this.restr}
/>

birthday accepts a prop that specifies the range of allowed birth dates in the form

restr = {start: new Date(2007,  4,  1), end: new Date(2010, 6, 20)}

. To exclude a birthday at which the user will be between 18 and 50 years old.
In other words, you need to get start and end for a user who is not less than 18, but not more than 50.
Please help me figure it out. Thanks everyone!