Born at Rabat in 1933, Agius commenced his art apprenticeship under Joseph Galea. He studied art at the Malta Society of Arts, Manufactures, and Commerce, in Valletta (1950-5 3) and at the School of Arts under George Borg. In 1957 he won a Malta government scholarship at the Scuola del Nudo dell’Associazione Artistica Internazionale at the Accademia di Belle Arti in Rome and at St Martin’s School of Art in London, where he was awarded the national diploma in design, modelling, sculpture, and letter-cutting.
Agius taught art in secondary schools and lectured at the University of Malta. He served as examiner for Oxford ‘0’ Level ceramics and was a member of the Malta Aesthetics Board. He won the first prize in the Human Rights Art Exhibition (1968), the Trophy for Best-Kept Village (1971) and in the Malta International Biennale (1999) and the second prize of the First International Art Biennale in Malta (1995). He was awarded the Onorificenza Del Dio Pan in Florence (1979), the Artist of the Year Award (1980), and the Targa D’Onore (1982).

Agius’s works are to be found in private collections in many parts of the world. Willy Brandt and Colonel Gaddafi possess some of his works. His major works include the Workers Monument at Msida; the 31 March 1979 Monument at Vittoriosa; the Dun Mikiel Xerri u Shabu monument in Valletta; the Mgr. G. DePiro monument at Rabat; the statue of Manwel Dimech at Valletta; the statue of Guze Ellul Mercer at Dingli; the Sette Giugno monument in Valletta; the bust of Anton Buttigieg at Qala, Gozo; Francis Ebejer at Dingli; Mikiel Anton Vassalli at Haz-Zebbug; Pawlu Xuereb at Rabat; St Joseph, at Rabat; and the sepulchral work Kurcifiss ta’ Llum for the Dominican Order.
Agius’s exhibited at the National Museum (1963), the Museum of Fine Arts (1974 and 1979), the Maltese Sculptures and Ceramics Exhibition at the Galleria Fenici (1981), the Art ‘84 - Malta Exhibition (1984), and the Public Service Week Art Exhibition (1996).
Agius is married to Maria Louise Sultana.