How long your aluminium windows will last depends on their quality. They should last 20 -30 years at least, but have been known to stay in good condition for up to 45 years. This is considerably longer than uPVC and wooden double glazing.
Porthmadog
Porthmadog well-known in your area as "Port", is a little Welsh seaside community and also former neighborhood, currently in the area of Penrhyndeudraeth in the Eifionydd area of Gwynedd. It has actually been so spelt formally given that 1974. Prior to 1972 in the management county of Caernarfonshire, it exists 5 miles (8 kilometres) eastern of Criccieth, 11 miles (18 kilometres) south-west of Blaenau Ffestiniog, 25 miles (40 kilometres) north of Dolgellau and 20 miles (32 km) south of Caernarfon. It had a population of 4,185 (2011 census). It established in the 19th century as a port exporting slate to England and in other places, but since the decline of the industry it has actually become a shopping center and tourist location. It has simple access to Snowdonia National Park and is the terminus of the Ffestiniog Railway. The 1987 National Eisteddfod was held in Porthmadog. It consists of the close-by towns of Borth-y-Gest, Morfa Bychan and also Tremadog.