This question is based on Selected Poems from Johnson, R et al(eds): New Poetry from Africa; Soyinka, (ed); Poems of Black Africa; Senanu, K.E, and Vicent, T.(ed.):
A Selection of African Poetry; Gbemisola A.: Naked Soles; Hayward, J.(ed.); The Penguin Book of English Verse and Nwoga, D.(ed.): West African Verse.

The mood of Peter's The Panic of Growing Older can be described as