Please assess the completion status of the following clinical trial:

Trial Title: Grass Pollen Subcutaneous Immunotherapy in Elderly Patients

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* a positive skin prick test (SPT), were positive for specific immunoglobulin E (sIgE), and had positive nasal provocation tests (NPTs) with grass pollen mixture allergens~Exclusion Criteria:~* hypersensitivity to other allergens, bronchial asthma, non-allergic rhinitis (especially senile or vasomotor rhinitis) and severe non-stable diseases.

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Patients active (Type: ACTIVE_COMPARATOR): Purethal Grass
- Patients placebo (Type: PLACEBO_COMPARATOR): Placebo

Based on this trial design, predict the completion outcome and termination type (if applicable).