Section 1-1.5. Application

Unless  otherwise stated therein, the provisions of this chapter apply
  to the estates, and to instruments making dispositions  or  appointments
  thereof,  of  persons  living  on  its effective date or born subsequent
  thereto, without regard to the date of execution of any such instrument;
  except that the provisions of this chapter shall not  impair  or  defeat
  any  rights  which  have  accrued  under dispositions or appointments in
  effect prior to its effective date.