How to set value in for-loop on Laravel blade

Basically {{ $last= date('Y')-120 }} in this part you are showing the value but you need to assign the value. So assign like this :

<?php $last= date('Y')-120; ?>

Same thing goes for the for loop too.Just compare the value. Do not put it in blade syntax.

<select id="year" name="year" class="form-control ">
    {{ $last= date('Y')-120 }}
    {{ $now = date('Y') }}

    @for ($i = $now; $i >= $last; $i--)
        <option value="{{ $i }}">{{ $i }}</option>
    @endfor
</select>