Below is the text of the press release issued today by the ITF (International Tennis Federation). Link to press release on ITF tennis.com
ITF SENIORS WORLD CHAMPIONSHIPS RESCHEDULED TO 29 AUG – 11 SEPT
The ITF has today confirmed, following consultation with the Croatian Seniors Tennis Association (host organiser) and other tournament stakeholders, that the 2021 ITF Seniors (50-55-60) World Championships in Umag, Croatia, originally scheduled to take place from 6-19 June 2021, will now be played from Sunday 29 August to Saturday 11 September. The event will remain in Umag, with the Team event running from 29 August – 3 September, before the Individual event from 4-11 September.
The ITF Seniors Committee has taken this decision in light of the ongoing situation, globally and in Croatia, with significant travel restrictions remaining in place for many nations and regions. At this time, too much uncertainty remains to allow participants to make the necessary arrangements for an event of this scale in June. The health and safety of everyone involved remains the foremost priority.
The rescheduled Seniors World Championships will immediately proceed [sic] the ITF Young Seniors World Championships which begin on 12 September. The ITF Young Seniors World Team and Individual Championships remain scheduled to take place in Umag from 12-25 September as well as the Super Seniors World Team and Individual Championships on Mallorca, Spain from 10-23 October 2021.
Players and teams are advised not to book any travel or accommodation until the tournament fact sheets have been published, approximately 4 months prior to the event.