function check() { var data = new Date() var year = data.getFullYear() var formyear = document.getElementById('txtyear') var res = document.querySelector('div#res') if (formyear.value.length == 0 || Number(formyear.value) > year) { window.alert('Ooops, something is wrong! Check the year your have typed and try again.') } else { var formgend = document.getElementsByName('radgender') var age = year - Number(formyear.value) var gender = "" var img = document.createElement('img') img.setAttribute("id", "photo") var type = "" if (formgend[0].checked) { gender = "masculine" if (age >= 0 && age <= 10) { // child img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/145/145867.svg") type = "a child" } else if (age > 10 && age <= 17) { // adolescent img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/2793/2793593.svg") type = "an adolescent" } else if (age > 17 && age < 65) { // adult img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/3048/3048122.svg") type = "an adult" } else { // elderly img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/2996/2996683.svg") type = "an elderly" } } else if (formgend[1].checked) { gender = "feminine" if (age >= 0 && age <= 10) { // child img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/2945/2945258.svg") type = "a child" } else if (age > 10 && age <= 17) { // adolescent img.setAttribute("src", "https://www.flaticon.com/premium-icon/icons/svg/3054/3054167.svg") type = "an adolescent" } else if (age > 17 && age < 65) { // adult img.setAttribute("src", "https://www.flaticon.com/premium-icon/icons/svg/122/122491.svg") type = "an adult" } else { // elderly img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/1663/1663016.svg") type = "an elderly" } } else if (formgend[2].checked) { gender = "non-binary" if (age >= 0 && age <= 10) { // child img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/2883/2883968.svg") type = "a child" } else if (age >10 && age <= 17) { // adolescent img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/3492/3492318.svg") type = "an adolescent" } else if (age > 17 && age < 65) { // adult img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/2426/2426407.svg") type = "an adult" } else { // elderly img.setAttribute("src", "https://www.flaticon.com/svg/static/icons/svg/1467/1467238.svg") type = "an elderly" } } } res.style.textAlign = "center" res.innerHTML = `You've selected a ${gender} gendered
person of ${age} years old (${type})` res.appendChild(img) }

Age Verifier (HTML/CSS/JS)