Pronunciation: [jˈuːθənɪd͡ʒ] (IPA)
Correct spelling for the English word "youthonage" is [jˈuːθənɪd͡ʒ], [jˈuːθənɪdʒ], [j_ˈuː_θ_ə_n_ɪ_dʒ] (IPA phonetic alphabet).