A shortage of players resulted in the withdrawal of Wem Albion B while two teams pulled out following the closure of Severnside Bowling Club.
But the league has gained five new teams from Battlefield, Bishop's Castle, Crescent, Oswestry Church and Prince Hotel.
Most of the matches are played on a Thursday afternoon, with nine teams playing their home matches on Wednesday afternoons.
League secretary Chris Kershaw said: “The league provides friendly competition and a valued social activity for retired people to enjoy every week.
“Having an afternoon senior citizens league enables some of the older bowlers who don’t like bowling in an evening to carry on playing competitively.”
The league has around 650 registered players, with more than 360 bowling every week.
Sponsor for the 12th season is Shrewsbury-based caravan, motorhome and campervan dealership Salop Leisure, which also has regional sales centres in Machynlleth and Stourport-on-Severn.
In addition to the weekly league matches, there will be three League Knock-Out competitions - the Dick Meyrick Cup for the top 16 teams, the Ron Smout Cup for the next 16 teams and the Sponsor’s Shield for the remaining 31 teams.
The preliminary round begins in May with the finals of all three competitions played simultaneously on September 9 at two venues.
The league’s annual singles knockout competition will be held on July 1 and the doubles on August 5, both at Meole Brace Bowling Club. The annual challenge match against the Mid Shropshire Senior Citizens League for the Dixon Cup will be played on September 2 in Telford.
The season will culminate with a President’s Day competition for the Bill Garratt President’s Cup on September 11 at Meole Brace BC.
Salop Leisure’s chairman Tony Bywater said the company was proud to be associated with such a successful and well run league.
“Many of the players in this league are caravan owners and customers of Salop Leisure who stay active and make the most of their leisure time in retirement,” he added.
“The league is very popular with senior citizens across Shropshire and the Welsh border. Long may it continue to prosper.”
The league’s officers are: president, Margaret Cooper, chairman Roger Whitfield, deputy chairman Harold Banks, league secretary, competition and results secretary, Chris Kershaw and treasurer, Margaret Cooper.
