After some months of absence, I got back on my horse, and finished my project. I would be grateful for your inputs and feedback 
! Many thanks!!!
Pretty well done. The page is responsive. Just check that your label’s for attribute name matches your corresponding input/select/radio etc ids.
Here what i mean:
<label id="number-label" for="age">Age: </label>
does not point to:
<input type="number" name="age" id="number" min="1" max="125" class="input-field" placeholder="Age">